Chondrocytes express molecules of the major histocompatibility complex class I and II, and probably the antigen (s) specific tissue (s). Chondrocytes isolated syngeneic grafts derived from hyaline cartilage or elastic cartilage is similar to regenerate the tissue from which, although less regular arrangement of cells. Allogeneic chondrocytes also regenerate cartilage, but is encapsulated in by lymphocytes and macrophages and gradually resorbed. Furthermore they induce a generalized reaction of the recipient, both cellular and humoral.